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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d9e9ce3f9afa6ddfe4642572c796f8e87154cc910e75270f1fcfb719aacd1c' 
  AND token = 'r9FWCkPuJwx++NjKL8N+u2JFI91t3s+dStT7c18SwAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}